Large deals, including Nvidia Corp's bid to buy UK-based chip firm Arm Ltd, have been abandoned following regulatory hurdles.

Here is a list of some mergers that faced strong antitrust scrutiny under the Biden regime:

DEALS UNDER SCRUTINY

DEAL CONTEXT

DEAL VALUE

Microsoft $69 billion "Microsoft has already shown

- that it can and will withhold

Activision content from its gaming

Blizzard rivals," Holly Vedova,

director of the FTC's Bureau of

Competition said in the

complaint.

Meta Unknown The Biden administration on

Platforms Dec. 8 accused Meta of trying

- Within to buy its way to dominance in

the metaverse, kicking off a

high-profile trial to try to

prevent the Facebook parent

from buying virtual reality app

developer Within Inc.

Amazon.com $1.7 billion The FTC in September asked the

- iRobot companies for more information

on the buyout.

The probe was launched to check

if the deal would illegally

boost the e-commerce giant's

market share in the connected

devices market as well as the

overall retail market,

according to Politico.

Kroger - $25 billion Kroger on Dec.6 said it

Albertsons received a request for

Companies additional information from the

FTC as part of the regulatory

review process of the merger.

$3.8 The U.S. Justice

JetBlue-S billion Department

pirit filed

a lawsuit on

March. 7 to stop JetBlue

Airways from buying Spirit

Airlines, saying the planned

$3.8 billion merger "would put

travel out of reach for many

cost-conscious travelers."

DEALS BLOCKED & ABANDONED

DEAL CONTEXT

DEAL

VALUE

Nvidia Corp - Arm More than SoftBank Group Corp in February

$80 shelved its blockbuster sale of

billion Arm Ltd to the U.S. chipmaker.

The FTC argued that competition

in the nascent markets for

chips in self-driving cars and

a new category of networking

chips could be hurt.

Penguin Random $2.2 Penguin owner Bertelsmann

House - Simon & billion scrapped the merger in

Schuster November. The Biden

administration said the deal

should be stopped because it

would lead to less competition

for blockbuster books and lower

advances for authors who earn

$250,000 or more.

Aon Plc - Willis $30 The companies called off the

Towers Watson Plc billion merger that would have created

the world's largest insurance

broker in July last year.

The DOJ argued the combination

would broadly reduce

competition and lead to higher

prices.

Lockheed Martin - $4.4 U.S. arms maker called off

Aerojet billion plans to acquire rocket engine

Rocketdyne maker Aerojet in February. FTC

Holdings said a deal would allow

Lockheed to use its control of

Aerojet to hurt other defense

contractors.

DEALS THAT WENT THROUGH

DEAL CONTEXT

DEAL VALUE

UnitedHeal About $8 billion The deal's completion in

th Group - October follows a U.S.

Change judge denying the Justice

Healthcare department's bid to stop

it. The DoJ had said access

to the target's claims

would give UnitedHealth a

view into rivals' health

plans.

Illumina - $7.1 billion FTC's chief administrative

Grail judge ruled in favor of the

companies, in a blow to the

regulatory body.

The FTC said in September

it would appeal the

decision.

(Reporting by Chavi Mehta in Bengaluru; Editing by Sriraj Kalluvila and Anil D'Silva)